分段函数法逐板计算非理想物系的理论板数  

Plate-to-plate Calculation for the Number of Theoretical Plates by Piecewise Function Method for a Nonideal System

作　　者：李泯茜 邓春[1] 曹睿[1] 刘梦溪[1] Li Minxi;Deng Chun;Cao Rui;Liu Mengxi(College of Chemical Engineering and Environment,China University of Petroleum,Beijing 102249)

机构地区：[1]中国石油大学(北京)化学工程与环境学院,北京102249

出　　处：《化工高等教育》2020年第3期144-147,共4页Higher Education in Chemical Engineering

基　　金：北京高校“优质本科课程”建设项目“化工原理”;中国石油大学(北京)教改项目“化工原理核心课程建设”“化工原理混合式教学课程建设”和“化工系统工程教学内容的革新”。

摘　　要：运用分段函数法可以逐板计算非理想物系的理论板数:首先对该非理想物系的气液平衡数据进行分段拟合,得到气液相组成之间的分段函数;然后利用逐板计算法求解非理想物系的理论板数。利用Aspen Plus中塔的Radfrac模块进行严格计算和验证,结果显示,采用分段函数法逐板计算的理论板数为11.72,严格计算法得到的理论板数为11,两者非常接近。因此,采用分段函数法逐板计算非理想物系的理论板数是一种正确而有效的方法。A piecewise function method of plate-to-plate calculation for the number of theoretical plates for a nonideal system is introduced in this paper.First,the vapor-liquid equilibrium data of the nonideal system are fitted to obtain the piecewise function between the molar fractions of gas and liquid phases.Next,the number of theoretical plates of the nonideal system is determined by plate-to-plate calculation method.In addition,the rigorous calculation module in Aspen Plus,Radfrac,is used for calculation and verification.Results show that the number of theoretical plates calculated by piecewise function method is 11.72,and the number of theoretical plates obtained by rigorous calculation method is 11,which are very close.It verifies the correctness and applicability of the proposed method in this paper.

关 键 词：非理想物系 相平衡 分段函数 逐板计算 

分 类 号：TQ028.13[化学工程]